UPD72012 datasheet(17/36 Pages) NEC

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Data Sheet S13918EJ3V0DS

µPD72012

2.4 Standard Endpoint Descriptor 1

Value

Standard ROM code

product

No.

Field

Size

(Bytes)

Contents

003

004

Mask

ROM code

product

bLength

Shows the size in bytes of standard endpoint

descriptor 1.

0x07

bDescriptorType

Shows that this is a standard endpoint descriptor.

0x05

bEndpointAddress

Shows the EndpointAddress of endpoint 1.

0x81

bmAttributes

Shows the attributes of endpoint 1

(Interrupt=“0x03”).

0x03

wMaxPacketSize

Shows the maximum packet size of endpoint 1.

0x0001

bInterval

For an Interrupt attribute endpoint, shows the polling

time in milliseconds using hexadecimal notation. For

a HUB, the maximum value that can be set (“0xFF”)

is entered.

0xFF

2.5 HUB Class Descriptor

(1/4)

Value

Standard ROM code

product

No.

Field

Size

(Bytes)

Contents

003

004

Mask

ROM code

product

bDescLength

Shows the size in bytes of the HUB class descriptor.

0x09

bDescriptorType

Shows that this is a HUB class descriptor.

0x29

bNbrPort

Shows the number of downstream ports the HUB

supports in a set.

For a standard ROM code product (003, 004), the

value varies according to the PVSEL pin setting.

It is “0x05” for a 5-port HUB (PVSEL=“H”), and

“0x04” for a 4-port HUB (PVSEL=“L”).

For a Mask ROM code product, the value in this field

can be set arbitrarily. Since two-way setting by

switching the PVSEL input level is possible for these

values, perform two-way specification. Note that the

values that are set for PVSEL=“H” are from “0x01” to

“0x05”, and the values that are set for PVSEL=“L”

are from “0x01” to “0x04”. The

µPD72012 enables

ports in turn starting from the smallest port number.

0x04

(PVSEL=“L”)

0x05

(PVSEL=“H”)

0x04

(PVSEL=“L”)

0x05

(PVSEL=“H”)

0xXX

(PVSEL=“L”)

0xYY

(PVSEL=“H”)

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